code: def _log_comb(n, k):
      return (
          special.gammaln(n + 1)
          - special.gammaln(k + 1)
          - special.gammaln(n - k + 1)
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import math
  import sys
  import numpy
  from scipy import special
  import six
label_desc: Use image node_id 5 for calling a global function with example usage: _log_comb(n, k) and returns: unknown